Classic Doctors in Doctor who 50th

So, we have heard news of David Tennant being involved in the 50th anniversary special of Doctor who coming up this year but apparently news that none of the classic series doctors have been asked. They could be lying like Tennant was but I want to make sure that there is homage payed to the classic doctors and not just the new series, it would also be great if Paul Mggan had another chance at showing us how good he is onscreen and also give Colin a fair go as he was basically fired from the role.